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  2. Limbal ring - Wikipedia

    en.wikipedia.org/wiki/Limbal_ring

    A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. The appearance and visibility of the limbal ring can be negatively affected by a variety of medical conditions concerning the peripheral cornea.

  3. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3] : 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of melanin in ...

  4. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color, but colored gold can come in a variety of different colors by alloying it with different elements. Colored golds can be classified in three groups:

  5. Corona (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Corona_(optical_phenomenon)

    In its full form, a corona consists of several concentric, pastel-colored rings around the celestial object and a central bright area called an aureole. The aureole is often (especially in case of the Moon) the only visible part of the corona and has the appearance of a bluish-white disk which fades to reddish-brown towards the edge.

  6. Halo (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Halo_(optical_phenomenon)

    A halo (from Ancient Greek ἅλως (hálōs) 'threshing floor, disk') [1] is an optical phenomenon produced by light (typically from the Sun or Moon) interacting with ice crystals suspended in the atmosphere. Halos can have many forms, ranging from colored or white rings to arcs and spots in the sky.

  7. Olympic symbols - Wikipedia

    en.wikipedia.org/wiki/Olympic_symbols

    There are five interlocking rings, coloured blue, yellow, black, green, and red on a white field. These together are known as the "Olympic rings." The symbol was originally created in 1913 by Coubertin. He appears to have intended the rings to represent the five inhabited continents: Africa, America, Asia, Europe, and Oceania.